talen314: What happens if a king moves into check of a ghost rider? It's not said explicitly, but are we to assume ghost riders move like knights? If an opponent is told a ghost rider moves, is the opponent told which ghost rider moves, or just that one of the ghost riders moved? Do ghost riders prevent check? That is, say my opponents king is on a1, I move my rook to c1, and my opponent has a ghost rider on b1, is he in check?

The option of the non-moving player to "block" a move makes it an oddity with respect to all the other 2-player games in BK: it requires both players to make actions before a 'move' is done.